Sharp humour a Roman Catholic displayed during disrupted Mass (7)
I believe the answer is:
sarcasm
'sharp humour' is the definition.
(sarcasm is sharp or caustic humour)
'a roman catholic displayed during disrupted mass' is the wordplay.
'roman catholic' becomes 'rc' (abbreviation for Roman Catholic).
'displayed during' indicates putting letters inside.
'disrupted' is an anagram indicator.
'a'+'rc'='arc'
'mass' with letters rearranged gives 'sasm'.
'arc' placed inside 'sasm' is 'SARCASM'.
(Other definitions for sarcasm that I've seen before include "Scornful attitude" , "Mocking irony" , "Wounding remark" , "Mordancy" , "Insulting lingo" .)